<template>
  <div class="todo-footer">
    <label>
      <input type="checkbox" v-model="cliAll" />
    </label>
    <span>
      <span>已完成{{ achieveTodo }}</span> / 全部{{ props.todoList.length }}
    </span>
    <button class="btn btn-danger" @click="emits('delTodoAll')">
      清除已完成任务
    </button>
  </div>
</template>

<script lang="ts">
import { defineComponent } from "vue";

export default defineComponent({
  name: "Footer",
});
</script>

<script setup lang="ts">
import { todoListType } from "../../App.vue";
import { computed } from "vue";
/**
 * 获取props参数
 */
const props = defineProps<{
  todoList: todoListType;
}>();
/**
 * 获取自定义事件
 */
const emits = defineEmits<{
  (event: "delTodoAll"): void;
  (event: "changeAll", value: boolean): void;
}>();
/**
 * 计算已完成的数量
 */
const achieveTodo = computed(() => {
  return props.todoList.reduce(
    (pery, item) => (item.done ? pery + 1 : pery),
    0
  );
});
/**
 * 计算全选或全不选
 */
const cliAll = computed({
  get() {
    return (
      props.todoList.every((item) => item.done) && props.todoList.length !== 0
    );
  },
  set(newType: boolean) {
    emits("changeAll", newType);
  },
});
</script>

<style scoped>
/*footer*/
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>
